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This was a couple weeks ago so I'm pretty sure those settings are correct. I was doing a inverted-v movement pausing for about a second on each side of the weld and making sure that the arc pushed as deep into the corner as possible. This was also done with a millermatic 251. I don't know how the softer arc characteristics affect a weld like this.

Based on what I saw I think the fix is a little higher wire speed and a little more pause on the outsides of the weld.

A little hot I would say for verticle up. Try turning it down to 18volts 275ipm. Hold your sides to let them fill quick across the center and try just going straight across the joint without trying to do an inverted v pattern.

Comment

Both methods work as jrcgsr stated try zig zagging and advance above the puddle, that way your not putting weld on weld but putting weld on fresh steel, hold the sides and let it back fill. That is the method I prefer, I find it gives a flatter weld allowing for better multi pass penetration.
Just my .02
Kevin

Comment

Sounds like a lot of heat for 3/16" plate. I would be around 16.8 volts and somewhere around 280 wfs. I do the inverted v as well with c25 gas set at 15 cfh or so. More voltage and it gets runny. Listen to your weld.....undercut is not enough fill....this can be do to excessive heat or not enough wire....

This was a couple weeks ago so I'm pretty sure those settings are correct. I was doing a inverted-v movement pausing for about a second on each side of the weld and making sure that the arc pushed as deep into the corner as possible. This was also done with a millermatic 251. I don't know how the softer arc characteristics affect a weld like this.

Based on what I saw I think the fix is a little higher wire speed and a little more pause on the outsides of the weld.